3com 5500-SI Manual De Usuario

Creating VLANs in Batches 107

To improve efficiency, you can create VLANs in batches by performing the operations 
listed in Table 98.

Voice VLANs are VLANs configured specially for voice data stream. By adding the 
ports with voice devices attached to voice VLANs, you can perform QoS-related 
configuration for voice data, ensuring the transmission priority of voice data stream 
and voice quality.

S5500 series Ethernet switches determine whether a received packet is a voice packet 
by checking its source MAC address. Voice packets can also be identified by 
organizationally unique identifier (OUI) addresses. You can also configure an OUI 
address for a voice packet or specify to use the default OUI address.

A voice VLAN can operate in two modes: automatic mode and manual mode. You 
can configure the operation mode for a voice VLAN according to data stream passing 
through the ports of the voice VLAN.

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When a voice VLAN operates in the automatic mode, the switch learns source 
MAC addresses from untagged packets sent by IP phones (an IP phone sends 
untagged packets when powered on) and adds the port with the IP phones 
attached to the voice VLAN. A port in a voice VLAN ages if the corresponding OUI 
address is not updated when the aging time expires.

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When a voice VLAN operates in the manual mode, you need to execute related 
commands to add a port to the voice VLAN or remove a port from the voice VLAN.

As for tagged packets sent by IP phones, a switch only forwards them (rather than 
learns the MAS addresses) regardless of the voice VLAN operation mode.

Voice VLAN packets can be forwarded by trunk ports and hybrid ports. You can 
enable a trunk port or a hybrid port to forward voice and service packets 
simultaneously by enabling the voice VLAN function for it.

Enter system view

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Create VLANs by specifying a 
VLAN ID range

vlan { vlan-id1 to vlan-id2 | all }

Required